//
//  CZTabbar.swift
//  微博01
//
//  Created by zhu on 15/11/23.
//  Copyright © 2015年 qqq. All rights reserved.
//

import UIKit

class CZTabbar: UITabBar {

    override func layoutSubviews() {
        super.layoutSubviews()
        //计算item的宽度
        let width = bounds.width / 5
        
        //创建Frame
        let frame = CGRect(x: 0, y: 0, width: width, height: bounds.size.height)
        
        //记录是第几个View
        var index = 0
        // 重新设置按钮位置(UITabBarButton)
//        print("layouSubviews: \(self.subviews)")
//        print("-----")
        
        for view in self.subviews
        {
            if view is UIControl && !(view is UIButton){// 撰写按钮不需要来设置frame, 忽略撰写按钮
                // 只有系统的UITabBarButton需要设置frame
                //                print("子控件:\(view)")
                // 设置frame   CGRectOffset可以平移frame
                view.frame = CGRectOffset(frame, CGFloat(index) * width, 0)
                
                index += index == 1 ? 2 : 1
            }
        }
        // 设置撰写按钮的frame
        composeButton.frame = CGRectOffset(frame, 2 * width, 0)
        
    }
//    懒加载
    lazy var composeButton: UIButton = {
        let button = UIButton()
//        设置参数
//        设置按钮背景图片
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        
        // 设置按钮图片
        button.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        button.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        
        //添加到tabbar里面
        self.addSubview(button)
        
        return button
    }()
    

}

























